@chai2,
there's a pretty cool book by Ursula K Le Guin called, The Lathe of Heaven, it's not really about time travel, it's about a young man who's dreams change reality, but only he knows about it, after being arrested for using forged prescriptions (he uses strong sedatives to suppress his dreaming) he's sent to a psychiatrist who, at first thinks he's crazy, but when he finds the man is telling the truth he tries to use the man's dreams to control the world, really good read
http://en.wikipedia.org/wiki/The_Lathe_of_Heaven
there was a pretty decent movie adaptation done around 1980 for PBS (a later cable version is not as good)